Miner&#39;s and like electric safety-lamp.



P. WOLF MINER/S AND LIKE ELECTRIC SAFETY LAMP.

vH-M W lh irenliur I Paul Wolf MW/Chassis C.e/ia 3 W- W mrn-cy HAULW'OLF, F ZWICKAU, GERMANY.

NKINERS AND LIKE ELECTRIC SAFETY-LAMP.

Specification of Letters latent.

Patented June 16, 1914.

Application filed January 80, 1913. Serial No. 745,206.

(d whomit may concern it 'uown that l, PAUL VVOLF, a subject rmanEmperor, residing at Zwic- Xony. in titermany, have invented cerand useul Improvements in Mind. like l l" Satety-Lamps,of which iolloiving is aspecification.

he object this invention is to provide improved means for fasteningelectric lamp bulbs in miners and like lamps. such fastenenabling thebulb to be fixed and reni ed in a convenient manner without reig t glasscylinder of the lamp.

cation is illustrated in the accomdrawing, in which,

re 1. is a central vertical section of the part or the lamp according toone i action. 2 is a similar section of l mp according to anotherconstruction, and 3 is a bottom plan view of the bulb tier shown in Fig.2. Fig. l is a sectional I illustrating a third form of constructcrringzin the first instance to Fig. 1, a rates the lamp bulb, which has a footI) provided with a metal sleeve c. An insulatplate (7 carries the glasscylinder 6 of the ip and has a central aperture provided th a metalliningf. The latter is in contact with a metal plate a let into theplate (Z.

The lamp is inserted from below into the socket formed by the saidaperture and its metal lininezthe upward movement of the hull) beinglimited by a Flange h at the bottom of the sleeve 0. and a washer orpacking rind i being inserted between such flange 71 the plate a to makea tight joint; ho lamp is held up in its socket by means spring Zwwhichis pivoted to the underot the plate 07 so that it can be turned :torinserting the electric lamp bulb. spriiipgvt is provided with adepression gaggement with a proiecting plug 72?. to which one of theleadingdn wires z'is con nected. The spring 70 doesnot make cont withthe sleeve f. but is in contact with r 3 terminal a, of the battery itwhen the ate is in position in the lamp as shown in The other leading-inwire .2 is joined to the sleeve 0, and is accordingly elect-rilvconnected by the socket lining f to the as 0', which rests on theterminal n of A battery.

in the construction shown in Figs. 2 and 3. is mp bulb a is alsoinserted from beroug'gh an aperture in an insi'ilating plate dcarrying-the glass cylinder e of the lamp and has afoot b fitting insaid aperture, but in this case the leadingin wires 2 are joined at thefoot of the bulb,

to contact plates 0 and 79 respectively, which are fixed to the foot andproject somewhat beyond the circumference thereof. These plates 0 and 79form stops limiting the upward-movementof the bulb, and when the bulbhas been inserted it is rotated so that the plates 0 and p are engagedwith metal hooks q and a respectively, joined to contact plates and 2ffixed to the under-side of the insulating plate (Z When the insulatingplate d is in position, as shown in Fig. 2, the plates sand 2, rest onthe terminals n and 11 respectively of-the battery m The constructionshown in Fig. 4 is in its general arrangement similar to that" shown inFig. 1, but the sleeve 0 around the foot of the lamp is screwed into thelining or socket f in the aperture of the insulating plate (Z l Vhat Iclaim as my invention and desire to secure by Letters Patent of theUnited States is 1. In an electric safety lamp. the combi-' nation of aframe. a lamp bulb having a base portion, an element having atransparent portion and completely surrounding the said bulb and carriedbv said frame. an insulating base for said frame closing'the bottomthereof. said insulating base ha ing an openine'making a close fit withsaid ba e portion of the lamp bulb. a contact on the periphery of saidbase portionof the lamp bulb and connected to the lighting e ement ofthe lamp, a second contact on said insulating base of the framecotiperating with said first contact and a third contact on said baseportion of the lamp bulb and connected to the lighting elementcarried bysaid insulating base serving to hold said base portion of the lamp inposition within said opening and cotiperating with said third contact,

2. In an electric safety lamp. the combination of a frame, a lamp bulbhaving a base portion, an element having a transparent portion andcompletely surrounding said bulb, said element being carried by saidframe, an insulating base for said frame completely closing the bottomthereof. said insulating base having an opening whereby to make a closefit vith said base portion or" the lamp bulb. a contact 'on theperiphery of said base portion of the lamp bulband connected to thelighting element of the lamp, a second contact on'said insulating baseof the -.frame cooperating with said first contact, a third contactonsaid base portion of the lamp bulb and connected to the lighting elementof the lamp, and a flexible conductcross section of the bulb proper, anelement having a transparent portion and completely surrounding saidlamp bulb, said element being entirely carried by said frame, aninsulating base for said frame closing the bottom thereof, saidinsulating base having an opening making a close fit With said baseportion of the lamp bulb, whereby said lamp bulb may be assed througsaid opening for positioning t e lamp bul a contact on the periphery ofsaid base portion of the lamp bulb and connected to the lighting elementof the lamp, a second contact on said insulating base of the framecooperating with said first contact, a third contact on said baseportion of the lamp bulb connected to the lighting element of the lampbulb, and a conducting element carried by said insulating base servingto hold said base portion of the lamp bulb in osition within saidopening and cooperating with said third contact.

In witness whereof I have signed this specification in the presence oftwo witnesses.

PAUL WOLF. Witnesses:

ROBERT H. NIER, TRUN KLINCK.

